FastCast—Monday, Aug. 1 to Friday, Aug. 5:
After an all-time record 6 consecutive days at 90+ degrees in Seattle, this weeklong heat wave will gradually come to an end. Expect Monday’s highs in the lowlands to be in the low to mid 80s. In Eastern Washington, relief will be virtually nonexistent, with highs reaching the mid 90s to low 100s on Monday and Tuesday, before finally cooling to the mid 80s to low 90s after that. Back to the lowlands…Tuesday through Friday will be in the mid to upper 70s, a huge relief after this heat wave. Expect overnight lows in the mid to upper 50s, seasonable for August. Additionally, clouds will return for the first time in over a week due to the return of onshore flow. Expect morning clouds every day except Friday. On Friday, flow turns northerly, eliminating most clouds. We will make another (potentially extended) run into the 80s starting next Saturday.
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Continue reading the full blog below!
From many individual records to Seattle’s longest stretch above 90 degrees, this was a significant heat wave for the Pacific Northwest. It will be remembered not for its temperature values, but for its longevity. It will try and hold on a bit longer than previously anticipated, especially in Eastern Washington. Let’s take a look at the forecast.
The HRRR high-resolution forecast for Monday is below, showing approximate high temperatures.
Expect highs in the low to mid 80s in the lowlands, coolest near the Sound and hottest east of I-5. The Portland area will reach the mid 80s to low 90s. Eastern Washington will continue baking, with highs in the mid 90s to mid 100s yet again. This heat wave has been quite bad for Western Washington, and just plain brutal on the east side of the mountains, with the Tri Cities Airport reaching 100+ degrees for 8 consecutive days, with 2-3 more days above 100 degrees ahead.
Western Washington will really feel the marine influence on Monday evening and through the night. Take a look at the NAM forecast for lows on Tuesday morning.
Lows in Western Washington will reach the upper 50s to low 60s, the coolest in nearly a week. Even Eastern Washington will be a bit cooler, with lows dropping to the upper 60s to low 70s, after a week with lows as high as 80 degrees.
Tuesday will finally be a near-average summer day in Western Washington, as seen in the NAM forecast below.
Expect lowland highs in the upper 60s near the water and the mid to upper 70s in the interior! Eastern Washington will continue gradually cooling down, with highs in the low 90s to low 100s. Portland will drop to the mid 80s.
Stay tuned for more information on the seasonable weather ahead and the potential chance of some showers in Western Washington later this week. You can find Sunday’s high temperatures below.
Information about the explosive McKinney Fire near Klamath River, California (near the CA/OR border, west of Yreka) can be found below:
Sunday High Temperatures:
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